[Qemu-devel] [RFC PATCH v9 22/23] replay: command line options

[Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>]

This patch introduces command line options for enabling recording or replaying
virtual machine behavior. "-record" option starts recording of the execution
and saves it into the log, specified with "fname" parameter. "-replay" option
is intended for replaying previously saved log.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
---
 cpus.c          |    1 +
 qemu-options.hx |    8 ++++++--
 vl.c            |   16 +++++++++++++++-
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/cpus.c b/cpus.c
index 5b2f896..e289a9d 100644
--- a/cpus.c
+++ b/cpus.c
@@ -895,6 +895,7 @@ static void qemu_wait_io_event_common(CPUState *cpu)
 static void qemu_tcg_wait_io_event(void)
 {
     CPUState *cpu;
+    GMainContext *context = g_main_context_default();
 
     while (all_cpu_threads_idle()) {
        /* Start accounting real time to the virtual clock if the CPUs
diff --git a/qemu-options.hx b/qemu-options.hx
index 85ca3ad..c62661a 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3038,11 +3038,11 @@ re-inject them.
 ETEXI
 
 DEF("icount", HAS_ARG, QEMU_OPTION_icount, \
-    "-icount [shift=N|auto][,align=on|off]\n" \
+    "-icount [shift=N|auto][,align=on|off][,rr=record|replay,rrfile=<filename>]\n" \
     "                enable virtual instruction counter with 2^N clock ticks per\n" \
     "                instruction and enable aligning the host and virtual clocks\n", QEMU_ARCH_ALL)
 STEXI
-@item -icount [shift=@var{N}|auto]
+@item -icount [shift=@var{N}|auto][,rr=record|replay,rrfile=@var{filename}]
 @findex -icount
 Enable virtual instruction counter.  The virtual cpu will execute one
 instruction every 2^@var{N} ns of virtual time.  If @code{auto} is specified
@@ -3064,6 +3064,10 @@ Currently this option does not work when @option{shift} is @code{auto}.
 Note: The sync algorithm will work for those shift values for which
 the guest clock runs ahead of the host clock. Typically this happens
 when the shift value is high (how high depends on the host machine).
+
+When @option{rr} option is specified deterministic record/replay is enabled.
+Replay log is written into @var{filename} file in record mode and
+read from this file in replay mode.
 ETEXI
 
 DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \
diff --git a/vl.c b/vl.c
index a5555fb..f12d3db 100644
--- a/vl.c
+++ b/vl.c
@@ -472,6 +472,12 @@ static QemuOptsList qemu_icount_opts = {
         }, {
             .name = "align",
             .type = QEMU_OPT_BOOL,
+        }, {
+            .name = "rr",
+            .type = QEMU_OPT_STRING,
+        }, {
+            .name = "rrfile",
+            .type = QEMU_OPT_STRING,
         },
         { /* end of list */ }
     },
@@ -2751,6 +2757,7 @@ int main(int argc, char **argv, char **envp)
 {
     int i;
     int snapshot, linux_boot;
+    const char *icount_option = NULL;
     const char *initrd_filename;
     const char *kernel_filename, *kernel_cmdline;
     const char *boot_order;
@@ -3770,6 +3777,8 @@ int main(int argc, char **argv, char **envp)
         }
     }
 
+    replay_configure(icount_opts);
+
     opts = qemu_get_machine_opts();
     optarg = qemu_opt_get(opts, "type");
     if (optarg) {
@@ -4137,6 +4146,11 @@ int main(int argc, char **argv, char **envp)
         qemu_opts_del(icount_opts);
     }
 
+    if (replay_mode != REPLAY_MODE_NONE && !use_icount) {
+        fprintf(stderr, "Please enable icount to use record/replay\n");
+        exit(1);
+    }
+
     /* clean up network at qemu process termination */
     atexit(&net_cleanup);
 
@@ -4173,7 +4187,7 @@ int main(int argc, char **argv, char **envp)
     }
 
     /* open the virtual block devices */
-    if (snapshot)
+    if (snapshot || replay_mode != REPLAY_MODE_NONE)
         qemu_opts_foreach(qemu_find_opts("drive"), drive_enable_snapshot, NULL, 0);
     if (qemu_opts_foreach(qemu_find_opts("drive"), drive_init_func,
                           &machine_class->block_default_type, 1) != 0) {